Google Imagery Accuracy

By default, Diamond Maps uses background ortho imagery provided by Google Maps.  Based on a comparison of this imagery to survey control points around the country, we find this imagery to be accurate to within 1 to 3 feet in most places.  However, we occasionally find places where it is off by much more.  This inaccuracy is most obvious whenever you are collecting points from a high-precision GPS/GNSS device.  If you suspect that your Google Imagery is wrong, report that to us and we can apply a correction (ie "shift") to the Google layers for your map(s).  If a correction has been applied to your map, you will see a link on the Layers screen next to the Google Imagery base layer indicating so.

We can also add your own locally provided imagery as an additional background layer.